21051113392 has 10 divisors (see below), whose sum is σ = 40786532228. Its totient is φ = 10525556688.

The previous prime is 21051113389. The next prime is 21051113417. The reversal of 21051113392 is 29331115012.

It is a self number, because there is not a number n which added to its sum of digits gives 21051113392.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657847278 + ... + 657847309.

Almost surely, 2^21051113392 is an apocalyptic number.

It is an amenable number.

21051113392 is a deficient number, since it is larger than the sum of its proper divisors (19735418836).

21051113392 is a wasteful number, since it uses less digits than its factorization.

21051113392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315694595 (or 1315694589 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

Adding to 21051113392 its product of nonzero digits (1620), we get a palindrome (21051115012).

The spelling of 21051113392 in words is "twenty-one billion, fifty-one million, one hundred thirteen thousand, three hundred ninety-two".